50 



HOW PLANTS GROW. 



number of projecting parts, or lobes, may be expressed by saying two-lohed, three' 

 lobed (Fig. 121), &c., according to their number. Or, more particularly, a leaf is 



Lohed ; when the pieces are roundish, or the incisions open or blunt, as in Fig. 

 120, 121 ; and 



Cleft; when cut about half-way down, with sharp and narrow incisions, as in 

 Fig. 122, 123 ; and so two-cleft, three-cleft, five-cleft, &c., according to the number. 



Parted ; when the cutting extends almost through, as in Fig. 124, 125. And we 

 say two-parted, three-parted, &c., to express the number of the parts. 



Divided ; when the divisions go through to the base of the leaf (as in Fig. 127), 

 or to the midrib (as in Fig. 126), which cuts up the blade into separate pieces, or 

 nearly so. 



Pinnate]; 



Palmulely 



140. As the cutting is always between the veins or ribs, and not across them, 

 the arrangement of the lobes depends upon the kind of veining. Feather-veined 

 leaves have the incisions all running in towards the midrib (as in the upper row of 

 figures), because the principal veins all spring from the midrib ; while radiate or 

 palmately veined leaves have them all running towards the base of the blade, where 

 the ribs all spring from the footstalk, as in the lower row of figures. So those of 



